Auxiliary power system.



N'. snow. AUXILIARY POWER SYSTEM. APPLICATION FILED JUEY GY 1916-1,259,307. Pamnted Mar.12,191&

WITNESSES-V 11v VENTOR.

lVorm [M9710 "A TTORNEY.

, t UNITED STATES PATENT- OFFICE.

' 'NORMAN' L. snow, or HARTFORD, Connnorrou'r, ASSIGNOR TO rnnmnnrwSTEAM.

I TURBINE COMPANY, or HARTEOBD,

NEC'I'ICUT.

CONNECTICUT, A CORPORATION OF CON- AUXILIARY POWER SYSTEM.

- I To all whom at may concern:

Be it known that I, NORMAN L. S'Now, a

' citizen of the United States, and a resident t ain new and usefulImprovements in lowing is a specification.

My invention relates to improvements in auxiliary power systems,providing an arrangement by which a secondary unit may Operate tocarrythe load .at any predetermined rate, but in particular will carry theload at normal or a higher rate than normaL. For instance, given anauxiliary steam plant running idle, the feed water pump might requirebut 10 H. P. to provide enough water for the boilers. If the mainsourceof power, whatever it might be, should fail and the steam plant becalled upon to carry the load, much more water would be required at theboilers, and consequently a greater horse-power at the feed water pumps.

In accordance with my invention a power unit, such as a steam turbine,might be connected with the feed water pump, running idle while thesteam plant was running idle but automatically controlled when the loadis thrown onto theauxiliary plant to out in and operate ata higher.speed to -provide the increased horse-power needed to operate the feedwater-pumps.

The foregoing being descriptive of one use of the invention, 1 haveillustrated diagrammatically in the drawings a simple Auxiliary PowerSystems, of which the folinstallation made in" accordance with my1nvent1on.

In the ,drawings, A denotes a primary unit such as a motor supplied withenergy from any source'and connected up with the generator B, or anyother demand for power, which it normally drives. C is thesecondaryunit, illustrated as a steam turbine. It is connected to thegenerator shaft,v

and under normal conditions its rotor is merely driven up to speed bythe motor A.

' D is the steam'line ofthe turbine, E a governor valve in the steamline, and F the governor controlling said valve. 10 is an automaticservice valve, illustrated as placed in the steam line in front oroutside of the governor valve E.- Obviously it may be positioned wheredesired... The valve disk 11 is loaded, giving it a normal tendency toSpecification of Letters Iatent.

Application filed July 6, 1916, Serial No. 107,774.

Patented Mar. 12, 1918.

open, but it is held in closed position by the trip 12 connected throughthe link 13 with the trigger 14, onearm of which is in the path of amovable part of the cut-in governor l5 driven from the generator shaft.Under normal conditions'while the motor A is driving the load, vtherotor of the turbine C is driven, the governor,F may function, but isinoperative because there is no steam passing through the governor valveE, the automatic service valve 10 being closed, and the cut-in governor15 held out of Contact with the trigger 14. As the speed decreases owingto any cause, such as a failure of the supply to the motor, or anincrease of the load, the cut-in governor 15 strikes the trigger 14:,withdraws the trip 12, and theloaded valve 11 drops, opening up thesteam supply. This governor valve E is operated by the governor F, andsteam is immediately passed into the turbine C ,which takes up the load.

It willbe apparent that the governor F may be set for any speed desired,elther below, even with, or higher than the normal speed at which themotor A drlves the generator B. It is to be remembered that theillustration is merely diagrammatic, and that the foregoing description"applies thereto.

I am aware that there are various ways n which the governor valve andautomatic service valve may be controlled and combined with one anotheror with other mechanisms; that the invention is broady adaptable for usewith any type of prlmary apparatus or energy source; and that other asthe auxiliary unit. Obviously the auxiliary unit need not be directlyconnected with the main source'of energy or the demand for energy.

In accordance withthe provisions of the statutes there has beendescribed the prineiple of operation-of my. invention together with adiagrammatic illustration thereof; but I desire to have it understoodthat the apparatus shown is only illustratlve, and

that the invention may be carried .out in other ways and under otherconditions.

I claim as my invention 1. In an apparatus of the character described, aprimary driverand a supply of motive-power therefor, a drivenunit-connected therewith and normally operated thereby; a secondarydriver connected with ;said driven unit, a motive-power supply therefor,meansfor cutting oil, the supply of motive-power, means independent ofgoverning mechanism to normally liold saidcutting ofl' means in positionto interrupt said supply, and means operative for releasing saidholding. means when the speed has decreased to a predetermined poin 2.In an apparatus of the character described, a primary driver and asupply of motive-power therefor, a driven unit connected therewith and.normally operated thereby; a secondary driver connected with said drivenunit, a motive-power supply therefor, means for cutting off the supplyof motive-power, means independent of overning mechanism to normallyhold sa d controlling means in position to interrupt said supply, andmeans operative for releasing said holding means when the speed hasdecreased to a predetermined point, and conto hold said valve shut Whilethe primarydriver is normally operative, and means operative forreleasing said holding means when the speed has decreased to apredetermined point. I

4. In an apparatus of the character described, a prlmary driver and asupply of' motive-power therefor, a driven unit con- 40 nected therewithand normally operated thereby; a secondary driver. connected with saiddriven unit, 'a motive-power; supply therefor, a valve for closing saidsupply, a catch to hold said valve in closed position,

and means sensitive to a decrease in speed to actuate said catch, andmeans operative upon the release of said catch to actuate said valve andmove it to o n position.

Y 5. In an apparatus of t e character de- '50 scrib'ed, a primary driverand a supply of motive-power therefor, a driven -unit connectedtherewith and normally operated thereby; a secondary driver connectedwith said driven unit, a motive-power supply v therefor, a valve forclosing said supply, a catch to hold said valve in closed position, agovernor connected with said primary driver and operative up'on a 7decrease inv speed thereof to move said catch to'release said valve, andmeans operative upon the, release of said valve to move it to openposition.

NORMAN L.- SNOW.

